Law professor and Instapundit Glenn Reynolds makes a lot of good points on the illegal immigration issue in this post.
The debate stinks: Most opponents of illegal immigration aren't racists. Most supporters aren't enemies of American civilization. The immigration problem is hard because it pits two things we care about -- freedom of opportunity and control of our borders -- against one another. It's also made harder because people fear that immigrants -- without the pressures of earlier eras -- won't try very hard to assimilate. Those fears may be overblown, but they're real, and the cries of racism, plus the occasional bit of Aztlan-irredentism from the fringes (calling for the reconquest of California, Arizona, etc., by Mexico), make them stronger.